Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6d396afa887930…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 23:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6a83482e21829ab2aed4d15a1ed3500a SHA-1: 7e4355af4fa0af5a5b5bad8c830fd47eb036dce3 SHA-256: 7b6d396afa887930d3cc49288ffe8a2ca83ec692db8cdab861e99431bbe384ef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://midufefew.ru/award?keyword=tipos+de+cardiomegalia+pdf, are likely used to redirect users to malicious sites or to improve search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/award?keyword=tipos+de+cardiomegalia+pdf PDF link annotation
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/1dd1e4a13c071.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/kufala-vajamabuwol-sifedujewawepo-timuzifagur.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/1060e529.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/edhbjbt/watch_spy_games_2020_online_free.pdfIn PDF document text
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/4bfba312.pdfIn PDF document text
    • http://nekretnine.site/4710352661294q1p.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/anKYiaq/mongolian_death_worm_movie_online.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/1033852.pdfIn PDF document text
    • https://cdn.sqhk.co/goxepijikun/hhMggdM/64699247411.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/3Dw6Aie/naughty_boy_lyrics_english.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/fizujirokixisebojep.pdfIn PDF document text
    • http://oneitshop.pro/general_anaesthesia_procedure8rd8k.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/wujodiliwalaxav_pasukupatopuzun_nixafosi.pdfIn PDF document text
    • https://topiropepejepok.weebly.com/uploads/1/3/4/5/134593977/a597c448.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/jhc3iaC/free_movie_bheja_fry_2007.pdfIn PDF document text
    • http://lisolu.org/51757945965zfujf.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/ruzeguxabul.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/jdaijAU/rocket_car_racing_apk_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savivubexikib.rf.gd/aprendizagem_motora.pdfIn PDF document text
    • http://bojobepuxotu.rf.gd/xavivowobokava.pdfIn PDF document text
    • http://lipelizirivalul.epizy.com/88954641591.pdfIn PDF document text
    • http://nijosafuraloto.rf.gd/56968394213.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 5424 bytes
SHA-256: c29490c75963964a1c6d76f8778f61a2683a24fd18f1ef124ce9007c9a77cdfa
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 13648 bytes
SHA-256: e93e6682e8804c170fb3e3c6f8701388646c0ba5fde4168b0a514d8be88e1233